scholarly journals Extreme rainfall trends over the Mekong Delta under the impacts of climate change

Author(s):  
Seung Kyu LEE ◽  
Truong An Dang

Purpose This study aims to investigate aspects related to the changing trends of the rainfall extremes in the entire Mekong Delta in the period of 32 years (1984-2015) applying rainfall extreme indices. First, the homogeneity tests were applied to assess the quality of observed rainfall data series. The authors, then, investigated three rainfall indices including the number of very heavy rainfall days 20 mm (R20), number of days above 50 mm (R50) and number of days above 100 mm (R100) applying the Mann-Kendall test and Sen’s slope estimate. Design/methodology/approach First, the homogeneity tests were applied to assess the quality of observed rainfall data series. The authors, then, investigated three rainfall indices including the number of very heavy rainfall days 20 mm (R20), number of days above 50 mm (R50) and number of days above 100 mm (R100) applying the Mann-Kendall test and Sen’s slope estimate. Findings The results of R20 pointed out that an insignificant upward tendency was found in the coastal provinces, whereas an insignificant downward tendency was also recorded in the inland provinces. Regarding the number of R50, a similar trend to R20 was recorded with five stations slightly increased and five stations slightly decreased. For the number of R100, the results recorded an absence of significant trends over the entire study area. Approximately 58.5% of stations show a slightly decreasing trend, while 41.5% of the remaining stations recorded a slightly increasing trend. Originality/value For the number of R100, the results recorded an absence of the significant trends over the entire study area. Approximately 58.5% of stations show a slightly decreasing trend, while 41.5% of the remaining stations recorded a slightly increasing trend. Of note is the fact that the number of R100 occurred more frequently in the northern provinces, which means the northern region is facing a high risk of flooding.

2015 ◽  
Vol 45 (1) ◽  
pp. 145-163 ◽  
Author(s):  
Pramod Kumar Singh ◽  
Sunil Kumar ◽  
Z. F. Bhat ◽  
Pavan Kumar

Purpose – This paper aims to focus on the effect of Sorghum bicolour on the quality characteristics of chevon cutlets and to evaluate the effect of clove oil on the storage quality of aerobically packaged chevon cutlets. Design/methodology/approach – Three levels of sorghum flour, namely, 2, 4 and 6 per cent, were incorporated in the formulation, and the products developed were assessed for various physicochemical, sensory, texture and colour parameters. Chevon cutlets containing optimum level of sorghum flour were treated with clove oil (100 ppm) and evaluated for storage quality for 15 days under refrigerated conditions (4 ± 1°C). The products were analysed for various physicochemical, microbiological and sensory parameters. Findings – Crude fibre, texture parameters, i.e. hardness, adhesiveness, springiness, cohesiveness, chewiness, gumminess and product redness value, showed significant (p < 0.05) increasing trend, whereas moisture per cent, fat content and overall acceptability decreased significantly (p < 0.05) with increasing levels of incorporation. Chevon cutlets containing 6 per cent sorghum flour were optimized as best. Thiobarbituric acid-reactive substance value (mg malonaldehyde/kg), total plate count (cfu/g) and psychrophillic count (cfu/g) showed a significant increasing trend (p < 0.05), whereas all the sensory parameters decreased significantly (p < 0.05) with increasing days of storage. The products were successfully stored for 10 days under refrigerated conditions (4 ± 1°C) without marked loss in quality. Originality/value – The paper has demonstrated the potential of sorghum as a fibre source in the development of designer chevon cutlets and effect of clove oil on the storage quality of aerobically packaged chevon cutlets.


Water ◽  
2021 ◽  
Vol 13 (16) ◽  
pp. 2248
Author(s):  
Jakob Siedersleben ◽  
Stefan Jocham ◽  
Markus Aufleger ◽  
Robert Klar

For morphodynamic modelling, riverbed survey data are essential as the basis for the evaluation of temporal riverbed development, mesh creation, and model calibration. To study the effects of uncertain geometry input on these issues, datasets of different spatial resolutions were analysed. As a result, cross-profile data were derived from high-resolution survey data, which are available for a river reach in the Upper Danube in Bavaria for several periods. Finally, the prediction quality of simulations based on cross-profile and high-resolution spatial data was assessed. The analysis of both datasets shows continuous riverbed erosion but of different magnitudes. However, complex riverbed geometry due to, e.g., scours, is depicted poorly by cross-profile data. In more homogenously characterised reaches, cross-profile data significantly more closely represents the riverbed geometry than the high-resolution spatial data base. Local misinterpretation of riverbed geometry by cross-profile data leads to deviations of calibration parameters in the entire study area. Consequently, these deviations in calibration outcome effect the model predictions. In this case, cross-profile calibration generally induces higher transport capacities, leading to more erosion in the study area compared to the model based on high-resolution spatial calibration. The general shape of predicted riverbed geometries is found to be similar but with local deviations, which are not limited to areas with complex river geometry.


2019 ◽  
Vol 22 (4) ◽  
pp. 738-748 ◽  
Author(s):  
T. Caloiero ◽  
R. Coscarelli ◽  
E. Ferrari

Abstract In this paper, an investigation on the temporal variability of seasonal and annual rainfall in the Calabria region (southern Italy) was carried out using a homogeneous and gap-filled monthly rainfall dataset of 129 rain gauges in the period 1951–2006. In particular, possible trends have been assessed by means of the Innovative Trend Analysis (ITA) technique, which allows the identification of a trend in the low, medium and high values of a series. Moreover, the results obtained with the ITA have been compared with the ones obtained with the Mann–Kendall test. These analyses have been performed in five rainfall zones (RZs) of the study area, characterized by different climatic conditions. As a result, both the methods evidenced a negative trend of the annual rainfall in the entire study area. On a seasonal scale, this negative tendency has been confirmed in autumn and winter although with some differences among the several RZs.


2003 ◽  
Vol 154 (8) ◽  
pp. 305-313 ◽  
Author(s):  
Roman Eyholzer ◽  
Martin Baumann ◽  
Rolf Manser

Faced with the challenging task of balancing forest interests and wildlife, the Swiss Forest Agency initiated the pilot programme«Game and Forest», which is committed to a philosophy of goal-oriented management practice and a redesign of forestry subsidizing. Within this programme the diverse goals of forestry and hunting have been amalgamated to a superimposed goal and set out in a corresponding contract. The Game-Forest-Management-Tool (GFMT) has been divised to simulate the effect of various strategies to deal with the complex problems of forest-wildlife. Optimal contract-fulfilling procedures can be simulated on a PC using this technical tool. The efficiency of the measures suggested by simulations that were carried out are being tested in a study area within the pilot programme, «Game and Forest». Half way through this trial, after two years, we can say that there has been no significant increase of non-browsed areas. In 2004, after the collection of data for the entire study area, we will be able to tell whether applying this computer simulated strategy truly leads to an augmentation of non-browsed area and a decrease in bark-peeled forests in the pilot area.


2019 ◽  
Vol 26 (4) ◽  
pp. 340-351
Author(s):  
Alberto Carlo Cajavilca ◽  
Marta Tostes

Purpose The purpose of this paper is to examine the role and contribution of San Martin and Chazuta subnational governments in promoting development and internationalization of the cocoa and chocolate value chain from the stakeholders’ perceptions. This work was based on a qualitative approach in which information triangulation method, information processing with evaluation rubric and WebQDA software were used. The results showed that stakeholders of both value chains perceive that the subnational government’s actions taken to develop and internationalize these value chains are poorly valued and insufficient. Likewise, six internationalization barriers were identified in which two are perceived as the main limitations: low productivity levels and access to innovations and technology. These results contribute to enrich the decision-making process of political authorities and public officials from the San Martin subnational governments. Moreover, they provide information, according to the Peruvian national requirements, on the perceptions needed to rethink and improve the governmental services available, especially productive activities in the rainforest area (Presidencia del Consejo de Ministros, 2015; Wiener Fresco, 2010). This can improve or create new extension services to increase the quality of the Chazuta’s cocoa and chocolate products and to facilitate their entry into more demanding and profitable markets (Shapira, y otros, 2015). Design/methodology/approach This paper has been developed by using a qualitative approach with an exploratory and descriptive scope. The objective was to examine a study case of how subnational governments contribute in the promotion of development and internationalization of agro-industrial value chains as alternatives to illicit crops (Hernandez, Fernandez, & Baptista, 2010). The Chazuta case was selected because it is representative of the region in terms of coca eradication and is located between two regions of high biodiversity – Cordillera Escalera Regional Conservation Area and Cordillera Azul National Park. Findings One of the issues hindering the ability of the Chazuta cocoa and chocolate producers is based on their perception that the subnational governments’ efforts are focused on meeting already-established goals and little emphasis is placed on solving productive problems. On the other hand, at an articulation level, the most relevant efforts have been connecting the cocoa and chocolate customers to Chazuta producers through events. In spite of this, such events are not considered a permanent activity and the producers do not perceive that these mechanisms enable them to maintain these long-term trade relationships. This can be explained by the fact that Chazuta cocoa and chocolate organizations recognize that they still have incipient productive capacities to meet the foreign market’s demand. Furthermore, associations, cooperatives and SMEs are not able to maintain constant levels of production quality, except the family-based business. Knowledge and techniques provided by subnational governments and private organizations are not fully used or implemented by the associations’ members. This low level of knowledge application can be explained by cultural factors and also because the producers receive multiple and sometimes contradictory information from various providers of technology extension services. This leads to inadequate use or non-implementation of productivity improvements, thus generating a virtuous circle in which production and quality of the goods remain at low levels, which hinders their entry into demanding and profitable markets. Research limitations/implications This paper has been developed with a qualitative approach considering an exploratory and descriptive scope. Chazuta case was selected because it is representative of the region in terms of eradication achievements and it is located between two regions of high biodiversity. A rubric is an evaluation method of individuals or organizations performance, taking into consideration the evaluator’s pre-established criteria to determine if the objectives and goals are being met. Based on these criteria, evidence and performance information is collected. Following, performance is graded based on the researcher’s predetermined criteria and finally a merit-based judgment is made on the performance. Practical implications The results contribute to enrich decision making of political authorities and public officials from San Martin subnational governments. They provide information, according to Peruvian national requirements, on the perceptions needed to rethink and improve provided government services, especially in rainforest area productive activities. This adds up to improvement or creation of new extension services to increase the quality of Chazuta’s cocoa and chocolate products, and to facilitate their entry into more demanding and profitable markets. Social implications The situation of San Martín region and Chazuta district is contextualized and emphasis is given to socioeconomic conditions and the value of cocoa as an alternative crop to coca. From 1980 to early 2000, Peru lived a period of generalized violence due to narcoterrorism, which had large-scale outreach in southern highland and rainforest areas. To deal with this situation, subnational governments in collaboration with international cooperation decided to consolidate agro-industrial value chains in order to generate legal income for rural populations. For this purpose, alternative crop policies were implemented and San Martin region achieved the best results. Originality/value This fieldwork was carried out as part of the undergraduate thesis but after fieldwork, with the use of online software tool WebQDA, codes were created to systematize and quantify the collected information in the content manager. The codes were created taking into account assessment and evaluation variables. Each value represented a code referred to a performance level as perceived by Chazuta cocoa and chocolate value chains stakeholders.


2021 ◽  
Vol 13 (11) ◽  
pp. 2129
Author(s):  
Fei Zhao ◽  
Lu Song ◽  
Zhiyan Peng ◽  
Jianqin Yang ◽  
Guize Luan ◽  
...  

Using toponym data, population data, and night-time light data, we visualized the development index of the Yi, Wa, Zhuang, Naxi, Hani, and Dai ethnic groups on ArcGIS as well as the distribution of 25 ethnic minorities in the study area. First, we extracted the toponym data of 25 ethnic minorities in the study area, combined with night-time light data and the population proportion data of each ethnic group, then we obtained the development index of each ethnic group in the study area. We compared the development indexes of the Yi, Wa, Zhuang, Naxi, Hani, and Dai ethnic groups with higher development indexes. The results show that the Yi nationality’s development index was the highest, reaching 28.86 (with two decimal places), and the Dai nationality’s development index was the lowest (15.22). The areas with the highest minority development index were concentrated in the core area of the minority development, and the size varied with the minority’s distance. According to the distribution of ethnic minorities, we found that the Yi ethnic group was distributed in almost the entire study area, while other ethnic minorities had obvious geographical distribution characteristics, and there were multiple ethnic minorities living together. This research is of great significance to the cultural protection of ethnic minorities, the development of ethnic minorities, and the remote sensing mapping of lights at night.


2021 ◽  
Vol 13 (1) ◽  
pp. 454-468
Author(s):  
Yumeng Song ◽  
Jing Zhang

Abstract We integrated hyperspectral and field-measured chlorophyll-a (Chl-a) data from the Kristalbad constructed wetland in the Netherlands. We developed a best-fit band ratio empirical algorithm to generate a distribution map of Chl-a concentration (C chla) from SPOT 6 imagery. The C chla retrieved from remote sensing was compared with a water quality model established for a wetland pond system. The retrieved satellite results were combined with a water quality model to simulate and predict the changes in phytoplankton levels. The regression model provides good retrievals for Chl-a. The imagery-derived C chla performed well in calibrating the simulation results. For each pond, the modeled C chla showed a range of values similar to the Chl-a data derived from SPOT 6 imagery (10–25 mg m−3). The imagery-derived and prediction model results could be used as the guiding analytical tools to provide information covering an entire study area and to inform policies.


2019 ◽  
Vol 16 (1) ◽  
Author(s):  
Zahra Dehbashi ◽  
Shaheen Khazali ◽  
Fateme Davari Tanha ◽  
Farnaz Mottahedian ◽  
Mahsa Ghajarzadeh ◽  
...  

Abstract Background Endometriosis can exert obvious negative effects on women’s quality of life. Excisional surgery is among the most effective treatments for severe pelvic endometriosis. The prevalence of severe pelvic adhesions following a laparoscopic examination of severe endometriosis varies between 50 and 100%. Temporary intraoperative ovarian suspension is a method for the reduction of adhesions is in the treatment of severe pelvic endometriosis. Given the importance and the prevalence of endometriosis and its complications, we conducted the present study to determine more effective adhesion-reducing methods with a view to improving the quality of the treatments provided. Methods The present prospective double-blind randomized clinical trial was conducted on 50 women of reproductive age (≥ 19 years) diagnosed with severe pelvic endometriosis on transvaginal ultrasound scans and vaginal examinations at Yas Hospital between 2014 and 2017. Women with severe endometriosis (stage III, stage IV, and deep infiltrating endometriosis) requiring an extensive bilateral dissection of the pelvic walls and the rectovaginal space, with preserved uterus and ovaries, were included in the study. The preoperative severity of ovarian adhesions was assessed in terms of ovarian motility, measured through a combination of gentle pressures applied with the vaginal probe and abdominal pressures applied with the examiner’s free hand. A table of random numbers was used to choose which ovary to suspend. The entire study population received standard general anesthesia. In the laparoscopic examination of the cases with severe endometriosis, both ovaries were routinely suspended to the anterior abdominal wall with PROLENE sutures. At the end of the surgery, one of the ovaries was kept suspended for 7 days, whereas the other ovarian suspension suture was cut. At 3 months postoperatively, all the patients underwent ultrasound scans for the assessment of ovarian motility and adhesions. The severity of pelvic pain was defined according to a visual analog score. After surgery, infertile women were followed for 2-4 years, and were contacted regarding the infertility treatment. Chemical and clinical pregnancy rates was compered between the two groups. Results Three months after laparoscopy, the adhesions were mild in 41 (82%) patients and moderate in 9 (18%) on the suspended side, and mild in 12 (24%) patients and moderate in 38 (76%) on the control side (P < 0.001). The mean dysmenorrhea score was 6.8 ± 1.5 before surgery and 4.5 ± 1.4 after surgery (P < 0.001). The chemical pregnancy rate and clinical pregnancy rate were not different in the suspended and control groups (P = 0. 62, P = 0.64). Conclusions The reduction in adhesions via ovarian suspension surgery promises reductions in the complications of endometriosis.


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